vdpau: Add MPEG-1/2 decoding via hwaccel infrastructure

Signed-off-by: Diego Biurrun <diego@biurrun.de>

1 files changed, 116 insertions, 0 deletions

diff --git a/libavcodec/vdpau_mpeg12.c b/libavcodec/vdpau_mpeg12.c
new file mode 100644
index 0000000000..d2d4ac3c25
--- /dev/null
+++ b/libavcodec/vdpau_mpeg12.c
@@ -0,0 +1,116 @@
+/*
+ * MPEG-1/2 HW decode acceleration through VDPAU
+ *
+ * Copyright (c) 2008 NVIDIA
+ * Copyright (c) 2013 Rémi Denis-Courmont
+ *
+ * This file is part of Libav.
+ *
+ * Libav is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * Libav is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Libav; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <vdpau/vdpau.h>
+
+#include "avcodec.h"
+#include "vdpau.h"
+#include "vdpau_internal.h"
+
+static int vdpau_mpeg_start_frame(AVCodecContext *avctx,
+                                  const uint8_t *buffer, uint32_t size)
+{
+    MpegEncContext * const s = avctx->priv_data;
+    AVVDPAUContext *hwctx    = avctx->hwaccel_context;
+    VdpPictureInfoMPEG1Or2 *info = &hwctx->info.mpeg;
+    VdpVideoSurface ref;
+    int i;
+
+    /* fill VdpPictureInfoMPEG1Or2 struct */
+    info->forward_reference  = VDP_INVALID_HANDLE;
+    info->backward_reference = VDP_INVALID_HANDLE;
+
+    switch (s->pict_type) {
+    case AV_PICTURE_TYPE_B:
+        ref = ff_vdpau_get_surface_id(&s->next_picture);
+        assert(ref != VDP_INVALID_HANDLE);
+        hwctx->info.mpeg.backward_reference = ref;
+        /* fall through to forward prediction */
+    case AV_PICTURE_TYPE_P:
+        ref = ff_vdpau_get_surface_id(&s->last_picture);
+        hwctx->info.mpeg.forward_reference  = ref;
+    }
+
+    info->slice_count                = 0;
+    info->picture_structure          = s->picture_structure;
+    info->picture_coding_type        = s->pict_type;
+    info->intra_dc_precision         = s->intra_dc_precision;
+    info->frame_pred_frame_dct       = s->frame_pred_frame_dct;
+    info->concealment_motion_vectors = s->concealment_motion_vectors;
+    info->intra_vlc_format           = s->intra_vlc_format;
+    info->alternate_scan             = s->alternate_scan;
+    info->q_scale_type               = s->q_scale_type;
+    info->top_field_first            = s->top_field_first;
+    // Both for MPEG-1 only, zero for MPEG-2:
+    info->full_pel_forward_vector    = s->full_pel[0];
+    info->full_pel_backward_vector   = s->full_pel[1];
+    // For MPEG-1 fill both horizontal & vertical:
+    info->f_code[0][0]               = s->mpeg_f_code[0][0];
+    info->f_code[0][1]               = s->mpeg_f_code[0][1];
+    info->f_code[1][0]               = s->mpeg_f_code[1][0];
+    info->f_code[1][1]               = s->mpeg_f_code[1][1];
+    for (i = 0; i < 64; ++i) {
+        info->intra_quantizer_matrix[i]     = s->intra_matrix[i];
+        info->non_intra_quantizer_matrix[i] = s->inter_matrix[i];
+    }
+
+    return ff_vdpau_common_start_frame(avctx, buffer, size);
+}
+
+static int vdpau_mpeg_decode_slice(AVCodecContext *avctx,
+                                   const uint8_t *buffer, uint32_t size)
+{
+    AVVDPAUContext *hwctx = avctx->hwaccel_context;
+    int val;
+
+    val = ff_vdpau_add_buffer(avctx, buffer, size);
+    if (val < 0)
+        return val;
+
+    hwctx->info.mpeg.slice_count++;
+    return 0;
+}
+
+#if CONFIG_MPEG1_VDPAU_HWACCEL
+AVHWAccel ff_mpeg1_vdpau_hwaccel = {
+    .name           = "mpeg1_vdpau",
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_MPEG1VIDEO,
+    .pix_fmt        = AV_PIX_FMT_VDPAU,
+    .start_frame    = vdpau_mpeg_start_frame,
+    .end_frame      = ff_vdpau_common_end_frame,
+    .decode_slice   = vdpau_mpeg_decode_slice,
+};
+#endif
+
+#if CONFIG_MPEG2_VDPAU_HWACCEL
+AVHWAccel ff_mpeg2_vdpau_hwaccel = {
+    .name           = "mpeg2_vdpau",
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_MPEG2VIDEO,
+    .pix_fmt        = AV_PIX_FMT_VDPAU,
+    .start_frame    = vdpau_mpeg_start_frame,
+    .end_frame      = ff_vdpau_common_end_frame,
+    .decode_slice   = vdpau_mpeg_decode_slice,
+};
+#endif